[AngularJS] ngModelController render function
ModelValue and ViewValue:
$viewValue: Actual string value in the view.
$modelValue: The value in the model that the control is bound to.
In Anuglar, it watchs the $modelValue for you and update $viewValue.
As you need to tell Angular when you set $viewValue and apply render() function to update.
Before the $render() function is called, the value will be passed into the $formatters.
$formatters: Array of functions to execute, as a pipeline, whenever the model value changes. The functions are called in reverse array order, each passing the value through to the next.
function formatter(value) {
if (value) {
return value.toUpperCase();
}
}
ngModel.$formatters.push(formatter);
Example:
/**
* Created by Answer1215 on 12/18/2014.
*/
angular.module('app', [])
.directive('bank', function($filter) {
return{
restrict: 'E',
template: '<div>Click me to add $10 into your account</div>',
require: 'ngModel',
//The ^ prefix means that this directive searches for the controller on its parents (without the ^ prefix, the directive would look for the controller on just its own element)
link: function(scope, element, attrs, ngModelCtrl) {
/*
ngModelCtrl.$formatters.push(function(modelValue) {
return "$" + modelValue;
});*/ //formatter is called before the render
ngModelCtrl.$formatters.push($filter('currency')); //$render function require user to implement it
ngModelCtrl.$render = function() {
element.text('Now you have: ' + ngModelCtrl.$viewValue);
}
}
}
})
<!DOCTYPE html>
<html ng-app="app">
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<div ng-init="money=10"></div>
<bank ng-model="money"></bank><br/>
<input type="text" ng-model="money" /><button type="reset" ng-click="money=0">Reset</button>
<script src="bower_components/angular/angular.min.js"></script>
<script src="app.js"></script>
</body>
</html>
$rollbackViewValue(): Cancel an update and reset the input element's value to prevent an update to the $modelValue, which may be caused by a pending debounced event or because the input is waiting for a some future event.
If you have an input that uses ng-model-options to set up debounced events or events such as blur you can have a situation where there is a period when the $viewValue is out of synch with the ngModel's $modelValue.
In this case, you can run into difficulties if you try to update the ngModel's $modelValue programmatically before these debounced/future events have resolved/occurred, because Angular's dirty checking mechanism is not able to tell whether the model has actually changed or not.
The $rollbackViewValue() method should be called before programmatically changing the model of an input which may have such events pending. This is important in order to make sure that the input field will be updated with the new model value and any pending operations are cancelled.
See: https://docs.angularjs.org/api/ng/type/ngModel.NgModelController
$sec service: We are using the $sce service here and include the $sanitize module to automatically remove "bad" content like inline event listener (e.g.<span onclick="...">). However, as we are using $sce the model can still decide to provide unsafe content if it marks that content using the $sce service.
angular.module('customControl', ['ngSanitize']).
directive('contenteditable', ['$sce', function($sce) {
return {
restrict: 'A', // only activate on element attribute
require: '?ngModel', // get a hold of NgModelController
link: function(scope, element, attrs, ngModel) {
if (!ngModel) return; // do nothing if no ng-model
// Specify how UI should be updated
ngModel.$render = function() {
element.html($sce.getTrustedHtml(ngModel.$viewValue || ''));
};
// Listen for change events to enable binding
element.on('blur keyup change', function() {
scope.$evalAsync(read);
});
read(); // initialize
// Write data to the model
function read() {
var html = element.html();
// When we clear the content editable the browser leaves a <br> behind
// If strip-br attribute is provided then we strip this out
if ( attrs.stripBr && html == '<br>' ) {
html = '';
}
ngModel.$setViewValue(html);
}
}
};
}]);
[AngularJS] ngModelController render function的更多相关文章
- template or render function not defined vue 突然报错了，怎么解决
报错图例如下:template or render function not defined vue 突然报错了,怎么解决什么错误呢,就是加载不出来,网上看了一通,是vue版本不对,是vue-comp ...
- Failed to mount component: template or render function not defined.
Failed to mount component: template or render function not defined. vue-loader13.0有一个变更就是默认启用了esModu ...
- vue render function & dataset
vue render function & dataset https://vuejs.org/v2/guide/render-function.html#The-Data-Object-In ...
- [Vue warn]: Error in render: "TypeError: Cannot read property '0' of undefined、vuejs路由使用的问题Error in render function
1.[Vue warn]: Error in render: "TypeError: Cannot read property '0' of undefined 注意,只要出现Error i ...
- "[Vue warn]: Failed to mount component: template or render function not defined"错误的解决
VUE中动态路由出错: vue.esm.js?a026: [Vue warn]: Failed to mount component: template or render function not ...
- vue h render function & render select with options bug
vue h render function & render select with options bug https://github.com/xgqfrms/vue/issues/41 ...
- vue render function
vue render function https://vuejs.org/v2/guide/render-function.html { // Same API as `v-bind:class`, ...
- template or render function not defined.
template or render function not defined. H_婷 关注 2018.08.16 17:22 字数 106 阅读 3859评论 0喜欢 2 下午写 Vue $par ...
- [Vue @Component] Control Template Contents with Vue's Render Function
Declaring templates and elements inside of templates works great for most scenarios. Sometimes you n ...
随机推荐
- FastDFS总结
前言 FastDFS主要解决互联网中小文件存储存储问题,例如图片,短视频,提供上传和下载功能,轻量级的设计,结构非常简单,主要包含三个角色客户端,Tracer服务,Storage服务.Tracer服务 ...
- ubuntu下安装selenium2.0 环境
参考:http://www.cnblogs.com/fnng/archive/2013/05/29/3106515.html ubuntu 安装过程: 1.安装:setuptools $ apt-ge ...
- HTTP协议学习笔记-2
HTTP报文 HTTP报文分为请求报文和响应报文(requeset and response) 请求报文的格式: <method> <request -URL> <ve ...
- DzzOffice管理员登陆方法和管理员应用介绍
DzzOffice的管理方式类似于windows的管理方式,是直接在桌面中,通过管理员应用进行系统中的所有管理里工作. 1.访问http://www.domain.com (你站点的访问地址) 2.点 ...
- python os.walk()和os.path.walk()
一.os.walk() 函数声明:os.walk(top,topdown=True,onerror=None) (1)参数top表示需要遍历的顶级目录的路径. (2)参数topdown的默认值是“Tr ...
- web服务器分析与设计（二）
面向对象分析与设计第二步:寻找对象,建立问题域模型 1,用例场景描述 接上一篇中的用例,编写用例场景 U1: 上网者:打开网站(www.xxx.com) 浏览器:连接网站 目标系统:接受连接 检查连接 ...
- 用VMware 8安装Ubuntu 12.04详细过程（图解）
转载 http://www.cnblogs.com/achillesyang/archive/2012/06/21/2557152.html
- Ubuntu 12.04 pppoe拨号问题
我的系统信息: Ubuntu 12.04.4 X64 Q001: 我学校需要使用pppoe拨号上网.我在宿舍架了个路由,可以使用无线连接拨号上网,也可以使用网线连接.在ubuntu下,使用无线连接时没 ...
- 【JAVA版】Storm程序整合Kafka、Mongodb示例及部署
一.环境 一台Centos6.5主机 Mongo 3.0 Kafka_2.11-0.8.2.1 Storm-0.9.5 Zookeeper-3.4.6 java 1.7 (后因在mac上打包的jar由 ...
- flot图表的使用
Flot是一套用Javascript写的绘制图表用的函式库, 专门用在网页上执行绘制图表功能, 由于Flot利用jQuery所以写出来的, 所以也称它为jQuery Flot ,它的特点是体积小.执行 ...